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Method for continuously separating propylene glycol monomethyl ether, cyclopentanone and propylene glycol methyl ether acetate

A technology of propylene glycol methyl ether acetate and propylene glycol methyl ether, which is applied in the field of solvent recovery, can solve the problems of difficult purification, complex components, low relative volatility of components, etc., and achieves the effects of reducing environmental pollution and reducing the discharge of hazardous wastes

Pending Publication Date: 2021-07-30
厦门中坤化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The difficulty in the separation of electronic waste liquid lies in: the composition is complex, the components have azeotropic and relatively low volatility, and it is difficult to purify
There is no waste liquid separation and purification scheme including propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate in the prior art

Method used

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  • Method for continuously separating propylene glycol monomethyl ether, cyclopentanone and propylene glycol methyl ether acetate
  • Method for continuously separating propylene glycol monomethyl ether, cyclopentanone and propylene glycol methyl ether acetate
  • Method for continuously separating propylene glycol monomethyl ether, cyclopentanone and propylene glycol methyl ether acetate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 3404.6g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate, and its chemical composition and content are shown in Table 1:

[0030] Table 1

[0031]

[0032] Reclaim propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate from above-mentioned waste liquid, concrete steps are as follows:

[0033] 1) Pass 3404.6g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate into the first rectification tower T1, and the distillation pressure is 101kPa, and the overhead fraction OP1 (propylene glycol methyl ether 93.13% , cyclopentanone 6.06%) is passed into the second rectification tower T2, and the bottom material (cyclopentanone+propylene glycol methyl ether acetate) is passed into the third rectification tower T3.

[0034] 2) Distillation under reduced pressure in the second rectification tow...

Embodiment 2

[0041] Take 3520.3g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate, and its chemical composition and content are shown in Table 3:

[0042] table 3

[0043]

[0044] Recovery of propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate from the above waste liquid

[0045]1) 3520.3 g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate is passed into the first rectification tower T1, and the distillation pressure is 101kPa, and the overhead fraction OP1 (propylene glycol methyl ether 93.36% , Cyclopentanone 5.84%) is passed into the second rectification tower T2, and the bottom material (cyclopentanone+propylene glycol methyl ether acetate) is passed into the third rectification tower T3.

[0046] 2) Distillation under reduced pressure in the second rectification tower T2, the distillation press...

Embodiment 3

[0053] Take 3510.8g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate, and its chemical composition and content are shown in Table 5:

[0054] table 5

[0055]

[0056] Recovery of propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate from the above waste liquid

[0057] 1) Pass 3510.8 g of electronic waste liquid containing propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate into the first rectification tower T1, and the distillation pressure is 101kPa, and the overhead fraction OP1 (propylene glycol methyl ether 94.15% , Cyclopentanone 5.24%) is passed into the second rectification tower T2, and the bottom material (cyclopentanone+propylene glycol methyl ether acetate) is passed into the third rectification tower T3.

[0058] 2) Distillation under reduced pressure in the second rectification tower T2, the distillation pressure ...

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Abstract

The invention discloses a method for continuously separating propylene glycol monomethyl ether, cyclopentanone and propylene glycol methyl ether acetate, and belongs to the field of solvent recovery. The method comprises the following steps that: electronic waste liquid passes through a first rectifying tower T1, separation is performed to obtain a tower top fraction OP1 and a tower bottom material BP1; the tower top fraction OP1 of the first rectifying tower T1 enters a second rectifying tower T2, and a tower top fraction OP2 and a tower bottom material BP2 are obtained through separation; the tower bottom material BP1 of the first rectifying tower T1 is introduced into a third rectifying tower T3, and a tower top fraction OP3 and a tower bottom material BP3 are obtained through separation; and the tower bottom material BP3 of the third rectifying tower T3 is introduced into a fourth rectifying tower T4, an entrainer is added, reduced pressure distillation is carried out, and a tower top fraction OP4 and a tower bottom material BP4 are obtained through separation. The hazardous waste emission can be reduced, and the environmental pollution is reduced. A proper amount of entrainer is added to carry out azeotropic impurity removal on a propylene glycol methyl ether acetate crude product, and the content of propylene glycol methyl ether acetate is purified from 97.0% to 99.5%.

Description

technical field [0001] The invention relates to the field of solvent recovery, in particular to a method for continuously separating propylene glycol methyl ether, cyclopentanone and propylene glycol methyl ether acetate from electronic waste liquid. Background technique [0002] Propylene glycol methyl ether, melting point -97°C, boiling point 119°C, density 0.922g / mL (25°C), miscible with water, soluble in organic solvents such as ether and chloroform. Cyclopentanone, melting point -58.2°C, boiling point 130.6°C, density 0.9487g / cm 3 (20°C), insoluble in water, soluble in most organic solvents such as alcohol and ether, easy to polymerize, especially in the presence of trace amounts of acid. Propylene glycol methyl ether acetate (PMGEA), colorless hygroscopic liquid, melting point -87°C, boiling point 149°C, water solubility (solvent soluble in water) 16.0ml / L (25°C), explosion limit: in air, 20°C When 1.5% ~ 7.0% (volume). [0003] Wafers are the basic material for man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/13C07C41/42C07C49/297C07C45/82C07C67/54C07C69/16
CPCC07C41/42C07C45/82C07C67/54C07C43/13C07C49/297C07C69/16
Inventor 郑启航魏文达张剑平许志刚郑祎敏杨毅融
Owner 厦门中坤化学有限公司